In reply to Somerset swede basher:
I've done this five times now, most recently last year, It's really, very good.
Everything that's been advised is correct, I'd take a light rack, you may not use much of it but it's useful just in case. Nothing larger than a blue Camalot...
You are out of the sun for the top half which can be a relief. There is at least one 'interesting' chimney pitch - (the penultimate one up to the tree - you will recognise it) .
The bolts are pretty much where you need them, but it is quite runout between them - except on that chimney pitch, I think there are three up to the tree.
Last time we linked a number of pitches and did it in 8
There's a couple of useful trip reports on Supertopo. The Old School time of 4 1/2 hours may be 'false memory'. I did it BITD (I thought in a similar time) and having just done it, linking pitches etc and with the advantage of familiarity it still took 4.5 hours. Perhaps I'm just getting old.......
Steve